linux-kernel - [PATCH] scsi: megaraid_sas: Use sysfs

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Date:   Sat, 24 Dec 2022 02:00:18 +0530
From:   Deepak R Varma <drv@...lo.com>
To:     Kashyap Desai <kashyap.desai@...adcom.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Saurabh Singh Sengar <ssengar@...rosoft.com>,
        Praveen Kumar <kumarpraveen@...ux.microsoft.com>,
        Deepak R Varma <drv@...lo.com>
Subject: [PATCH] scsi: megaraid_sas: Use sysfs_emit in show function
 callsbacks

According to Documentation/filesystems/sysfs.rst, the show() callback
function of kobject attributes should strictly use sysfs_emit() instead
of sprintf() family functions. So, make this change. Also, merge split
lines wherever possible due to shortened length of lines.

Issue identified using the coccinelle device_attr_show.cocci script.

Signed-off-by: Deepak R Varma <drv@...lo.com>
---
 drivers/scsi/megaraid/megaraid_sas_base.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 3ceece988338..7fa472ab0b94 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -3335,7 +3335,7 @@ fw_crash_buffer_size_show(struct device *cdev,
 	struct megasas_instance *instance =
 		(struct megasas_instance *) shost->hostdata;

-	return snprintf(buf, PAGE_SIZE, "%ld\n", (unsigned long)
+	return sysfs_emit(buf, "%ld\n", (unsigned long)
 		((instance->fw_crash_buffer_size) * 1024 * 1024)/PAGE_SIZE);
 }

@@ -3382,14 +3382,14 @@ fw_crash_state_show(struct device *cdev,
 	struct megasas_instance *instance =
 		(struct megasas_instance *) shost->hostdata;

-	return snprintf(buf, PAGE_SIZE, "%d\n", instance->fw_crash_state);
+	return sysfs_emit(buf, "%d\n", instance->fw_crash_state);
 }

 static ssize_t
 page_size_show(struct device *cdev,
 	struct device_attribute *attr, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%ld\n", (unsigned long)PAGE_SIZE - 1);
+	return sysfs_emit(buf, "%ld\n", (unsigned long)PAGE_SIZE - 1);
 }

 static ssize_t
@@ -3399,7 +3399,7 @@ ldio_outstanding_show(struct device *cdev, struct device_attribute *attr,
 	struct Scsi_Host *shost = class_to_shost(cdev);
 	struct megasas_instance *instance = (struct megasas_instance *)shost->hostdata;

-	return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&instance->ldio_outstanding));
+	return sysfs_emit(buf, "%d\n", atomic_read(&instance->ldio_outstanding));
 }

 static ssize_t
@@ -3409,7 +3409,7 @@ fw_cmds_outstanding_show(struct device *cdev,
 	struct Scsi_Host *shost = class_to_shost(cdev);
 	struct megasas_instance *instance = (struct megasas_instance *)shost->hostdata;

-	return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&instance->fw_outstanding));
+	return sysfs_emit(buf, "%d\n", atomic_read(&instance->fw_outstanding));
 }

 static ssize_t
@@ -3419,7 +3419,7 @@ enable_sdev_max_qd_show(struct device *cdev,
 	struct Scsi_Host *shost = class_to_shost(cdev);
 	struct megasas_instance *instance = (struct megasas_instance *)shost->hostdata;

-	return snprintf(buf, PAGE_SIZE, "%d\n", instance->enable_sdev_max_qd);
+	return sysfs_emit(buf, "%d\n", instance->enable_sdev_max_qd);
 }

 static ssize_t
@@ -3473,8 +3473,7 @@ raid_map_id_show(struct device *cdev, struct device_attribute *attr,
 	struct megasas_instance *instance =
 			(struct megasas_instance *)shost->hostdata;

-	return snprintf(buf, PAGE_SIZE, "%ld\n",
-			(unsigned long)instance->map_id);
+	return sysfs_emit(buf, "%ld\n", (unsigned long)instance->map_id);
 }

 static DEVICE_ATTR_RW(fw_crash_buffer);
--
2.34.1